Regressions on trunk at revision 269960 vs revision 269932

[H.J. Lu (Intel64 AVX)]

New failures:

New passes:
FAIL: g++.dg/vect/pr87914.cc  -std=c++14  scan-tree-dump vect "OUTER LOOP VECTORIZED"
FAIL: g++.dg/vect/pr87914.cc  -std=c++17  scan-tree-dump vect "OUTER LOOP VECTORIZED"
FAIL: g++.dg/vect/pr87914.cc  -std=c++98  scan-tree-dump vect "OUTER LOOP VECTORIZED"